Manufacture of tubes.



No. 808,001. PATENTED DEO..19, 1905. 0. BRIBDE.

MANUFACTURE OF TUBES. APPLIOATION FILED AUG. 29. 1904.

i. HHHHHIH OTTO BRIEDE, OF BENRATH, NEAR DUSSELDORF, GERMANY.

MANUFACTURE OF TUBES.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Original application filed May 4,1903, Serial No. 155,599. Divided andthis application filed August 29, 1904!! Serial No. 222,680.

To all whom it may concern:

Be it known that I, OTTO BRIEDE, a citizen of Germany, residing atBenrath, near Diisseldorf, in the Province of the Rhine, in the Kingdomof Prussia, German Empire, have invented or discovered a certain new anduseful Improvement in the Manufacture of Tubes, of-whichimprovement thefollowing is a specification.

The invention described herein relates to certain improvements inreducing billets, &c., by means of oscillating or swinging dies orswages, said improvements being particularly applicable to theprogressive reduction of hollow billets for the production of seamlesstubes.

Theinvention has for its object a back-andforth movement of the billetsynchronous with the movement of the dies or swages, with a limitationof the movement of the billet in one direction proportional to reductionto be effected by the swages on each operative or reducing stroke.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a side elevation of a form of apparatus adapted to thepractice of my invention, and Fig. 2 is a detail view illustrating themanner of connecting the rotary head to the feed-bar.

In the practice of my invention the heated billet is attached to asuitable holder, which in the manufacture of tubes consists of a mandrelb, secured in any manner to the feedrod h. This feed-rod is mounted insuitable bearings m on the bed of the machine in such manner as to becapable of reciprocation simultaneous with the oscillations of thereducing dies or swages a. These dies or swages are provided withtapering grooves in their adjacent faces, so that the pass formed by thegrooves will vary transversely with the swing or oscillation of theswages, which may be operated in anysuitable manner known in the art.

The reciprocation of the billet holder or support synchronous with thedies may be effected by the grip of the dies on the article operated on,but preferably by power applied to the feed-bar cooperating with thedies or swages. l/Vhile power may be applied in any convenient manner tothe feed, it is to connect the feed-bar to the swages or dies or theiroperating mechanism. In the construction shown a threaded portion offeed-bar passes through a threaded opening in the sliding block orcarriage g, which is connected by a link f to a lever e, and the latteris connected by a pitman d to one of the dies or swages.

Provision is made for imparting a forward or feed movement of thefeed-rod independent ofthe sliding block proportional to the reductionto be effected by the swages during each oscillation. This feed movementcan be produced in many waysas, for example, by rotating the feed-rod,which, as previously stated, may be formed with a threaded portionengaging the internal threaded opening through the sliding block. By therotation of this feed-rod it, with the holder and ingot, would beadvanced without any change in the back-and-forth movement of thesliding block. The forward feed of the billet occurs at the time thelatter is released from the bite of the swages or dies or is, in otherwords, intermittent or step by step. Such feed can be effected bymechanism operative on the feed-bar to shift the same at the instant ofrelease by the swages, or mechanism can be employed which would store uppower, as by the compression of a spring which will become operative toshift the billet when released by the swages. Such a construction isshown in the drawings, where the powerdriven wheel 2' is so mounted onthe feed-rod that the latter will rotate with the wheel, but is free tomove longitudinally through the same, the wheel being provided with ahub rotatively mounted in a bearing n on the bed of the machine. Thisconstruction permits of the back-and-forth reciprocation of the feed-rodwithout disengagement with the power-driven wheel. If the wheel isdriven continuously, a spring lc is interposed between an abutment onthe feed-rod and a head 0, movably mounted on the billet-holder, as themandrel I), and serving as a bearing for the billet or ingot. WVhile thebillet is gripped by the dies or swages, it cannot be fed throughbetween them, and hence forward movement of the feed-bar during suchgripping by the dies will result only in the compression of the springk; but as soon as the billet is released the spring will expand andforce the billet forward between the dies or swages. In other words,feed of the billet or ingot is intermittent.

It is desirable that the ingot or billet should be rotated duringreduction and preferably at each forward feed. Many ways will readlooily suggest themselves to or be devised by those skilled in the art forefiecting this rotation; but the construction shown seems to be readilyapplicable for this purpose. construction consists in connecting therespective ends of spring k to the abutment on the feed-rod and to thehead 0, which, as shown in Fig. 2, is constructed to engage the rear endof the billet, as by prongs or other suitable means. When the feed-rodis rotated to effect the forward movement, as described, while thebillet is gripped by the dies or swages, the spring will be placed in atorsional strain also, which when the billet is released will becomeeffective to rotate the latter.

It is characteristic of my improved method that the billet moves backand forward with the swages, the forward movement being equal to theforward swing of the swages but the backward movement is limited by anamount equal to the forward movement of the feed-bar or proportional tothe reduction to be efiiected on the next forward swing or oscillationof the swages. In other words, the billet while having a reciprocatingmovement will advance step by step through between the swages on eachback-and-forth movement, such advance being equal to the feed effectedby the feed-power and to the elongation by the reduction effected by theoscillating swages.

It will be noted that in the swaging method described herein theoscillatory swaging-dies engage or have a bite on the end of the billet,which, except at the brief moment of feed,is practically continuous, asa result of which the dies at the time when the feed is desired put thebillet in position for such feed and also determine or fix and limit theamount of feed. In other words, the feed movement of the billet isdetermined and controlled by the operative faces of the oscillatingswages. Although the feeding mechanism may be so constructed as to beready for operation at This any time,it does not become practicallyoperative to shift the billet forward until the swages reach a positionin their oscillation where their bite is relaxed or entirelyloosened.When the grip of the swages is relaxed, the billet is moved forwarduntil a portion thereof abuts against the operative faces of the swages.This forward or feed movement will be dependent to a large extent on thereduction previously efiected and will be largely independent of themovement of the feed mechanism itself.

WVhile I have described with some particularity a form of apparatus forcarrying out the method claimed, no claim is made herein for suchapparatus, as the same forms the subject-matter of an application filedby me May 4, 1903, numbered serially 155,599, of which application thispresent case forms a division.

I claim herein as my invention- 1. As an improvement in the art ofswaging billets, &c., the method herein described, which'consists incausing the billet to move back and forth synchronouslywith oscillatingswaging-dies, causing a forward feed movement of the billet independentof its reciprocation, and limiting such feed movement by the dies orswages substantially set forth.

2. As an improvement in the art of swaging billets, &c., the methodherein described, which. consists in causing the billet to' move backand forth synchronously with and by oscillating dies or swages, causinga forward feed movement of the billet independent of the reciprocation.of the latter and limiting such feed movement by the dies or swagessubstantially set forth.

In testimony whereof I have hereunto set my hand.

OTTO BRIEDE.

Witnesses:

WILLIAM EssENWEIN, PETER LIEBER.

